Your printer is offline. Unplug it from the wall, and plug it back in after 2 minutes. OR, you have a hardware malfunction, in which case, unless you are a technician, or have the motivation to become one, the printer is an anchor!
What does the PC say when you try to print? If it doesn't report anything, look into the print queue and clear it.
You can also possibly have the front door open, and it is saying CLOSE THE LID DUMMY!